Question

if length is 9 CM width is 12 CM and surface area is 426 cm². find the height and volume​

Answer 1

Answer:

• total surface area of a cuboid is 2(lb+bh+lh)
• height=x
• 2(lb+bh+lh)=426 cm²
• 2{(9×12)+(12×x)+(9×x)=426
• 2(108+12x+9x)=426
• 2(108+21x)=426
• 108+21x=426÷2
• 108+21x=213
• 21x=213-108
• 21x=105
• x=105÷21
• x=5
• height=5.
• volume of cuboid=lbh
• volume=9×12×5
• volume=540 cm³